Applied Physics Letters, 12 June 2006
Appl. Phys. Lett. 88, 241918 (2006) (3 pages)
©2006 American Institute of Physics. All rights reserved. 
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Spatial imaging and mechanical control of spin coherence in strained GaAs epilayers
H. Knotz, A. W. Holleitner, J. Stephens, R. C. Myers, and D. D. Awschalom(a)
Center for Spintronics and Quantum Computation, University of California, Santa Barbara, California 93106
(Received: 22 November 2005; accepted: 27 April 2006; published online: 14 June 2006)The effect of uniaxial tensile strain on spin coherence in n-type GaAs epilayers is probed using time-resolved Kerr rotation, photoluminescence, and optically detected nuclear magnetic resonance spectroscopies. The band gap, electron spin lifetime, electron g factor, and nuclear quadrupole splitting are simultaneously imaged over millimeter scale areas of the epilayers for continuously varying values of strain. All-optical nuclear magnetic resonance techniques allow access to the strain-induced nuclear quadrupolar resonance splitting in field regimes not easily addressable using conventional optically detected nuclear magnetic resonance. ©2006 American Institute of Physics
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